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Simplifying 72 + (x + 15) = 3x + -13 Reorder the terms: 72 + (15 + x) = 3x + -13 Remove parenthesis around (15 + x) 72 + 15 + x = 3x + -13 Combine like terms: 72 + 15 = 87 87 + x = 3x + -13 Reorder the terms: 87 + x = -13 + 3x Solving 87 + x = -13 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 87 + x + -3x = -13 + 3x + -3x Combine like terms: x + -3x = -2x 87 + -2x = -13 + 3x + -3x Combine like terms: 3x + -3x = 0 87 + -2x = -13 + 0 87 + -2x = -13 Add '-87' to each side of the equation. 87 + -87 + -2x = -13 + -87 Combine like terms: 87 + -87 = 0 0 + -2x = -13 + -87 -2x = -13 + -87 Combine like terms: -13 + -87 = -100 -2x = -100 Divide each side by '-2'. x = 50 Simplifying x = 50
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